Drill stand

ABSTRACT

Drill stand ( 1 ) including a base plate ( 2 ), a carriage ( 3 ) arranged to be able to carry a drill motor and a drill column ( 4 ) which is pivotally mounted to a front part ( 5 ) of the base plate. The drill column is supported by a back support ( 7 ) located in a longitudinal direction rear of the drill column and is pivotally mounted to a back part ( 8 ) of the base plate, and a back side of the drill column facing the back support ( 7 ) is arranged as a track ( 10 ) having lateral wings ( 11, 11′ ), a right side wing ( 11 ) and a left side wing ( 11′ ). A clamping arrangement fastened to both of the back support and the track ( 10 ) enabling them to be fixed to each other in different positions along the track by clamping.

TECHNICAL FIELD

The present invention relates to a drill stand designed to be used witha drill motor and a core drill and to normally be fixedly fastened to afloor or wall using either an expander bolt or vacuum. In the lattercase a vacuum cap and gasket is applied to the expander bolt aperture.The drill stand preferably has a back support clamped to its drillstand.

BACKGROUND OF THE INVENTION

When core drilling in concrete, asphalt, brickwork or similar buildingmaterials, a drill stand is usually used. The drill stand is mounted viaanchor bolt(s) or vacuum. Usually the drilling is done in a floor or awall using a drill bit to prepare a hole with a diameter of usually100-200 mm, and in extreme cases up to 600 mm. Often it is required todrill either a straight or an angled hole. Therefore a special kind ofdrill stand has a drill column that can be tilted, usually from zerodegrees to forty-five degrees. The drill column is often fixed with atiltable back support that is slidably connected to the drill column andis locked to the column in a suitable position by a clampingarrangement.

Husqvarna DS 160 C is a drill stand of this type. It has a clampingmechanism comprising a screw to be tightened on the rear side of itsdrill column; i.e., from the back side of the drill stand. This issomewhat awkward as all other important settings of the drill stand aremanaged from the side of the drill stand.

OBJECTS OF THE INVENTION

An object of the invention is to provide a drill stand having animproved clamping mechanism and a more reliable system for vacuumlocking.

SUMMARY OF THE INVENTION

At least one of the above mentioned objects and/or problems are met byproviding a drill stand in accordance with the invention having thecharacteristics appearing from the appended claims. The drill stand,according to the invention, is thus essentially characterised in thatthe clamping arrangement comprises a center clamp having a flange partfitting in the elongate opening and having protrusions, right and left,from the flange part intended to contact the inside forward surfaces,right and left, when clamping. The clamping arrangement furthercomprises an outer clamp right and an outer clamp left, each having atleast a lateral contact surface arranged to contact the respectiveoutside rear surface when clamping, each outer clamp being arrangedoutside of the center clamp and having outer angled contact elementsintended to cooperate with center angled contact elements to provide alongitudinal backwards motion of the center clamp in relation to theouter clamps when a clamping element is pressing the outer clampslaterally together against the center clamp making its protrusions pressagainst the inside forward surfaces, and making the lateral contactsurfaces of the outer clamps press against the outside rear surfaces;i.e., providing clamping in a longitudinal direction. In this way aclamping in the longitudinal direction can be achieved from the side ofthe drill stand. This is a distinct advantage compared to the prior artdrill stand mentioned above.

In a further improved embodiment, the outer clamps, right and left, eachhave a longitudinal contact surface, right and left, contacting alongitudinal contact surface of the track or drill column, right andleft when clamping therefore creating a clamping also involving clampingin a lateral direction in addition to the clamping in the longitudinaldirection. This provides an especially good clamping where six contactsurfaces of the track are involved. A further improvement is a morereliable vacuum mounting where a slot guard (32) is provided around theexpander bolt aperture(s). The slot guard is preferably made of steeland is more scratch resistant than the base plate, which is usually madeof aluminium. Thereby, the slot guard provides a more reliable seal forthe vacuum locking than the prior art solutions. This is because the topsurface of the slot guard is provided with a gasket for sealing betweenthe slot guard and a vacuum cap. Further features and advantages arepresented in the description of preferred embodiments with the help ofthe drawing figures.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described in the following in closer detail bymeans of various embodiments thereof with reference to the accompanyingdrawings wherein like numeral references have been used in the variousdrawing figures to denote corresponding components.

FIG. 1 is a perspective view of a drill stand according to the presentinvention.

FIG. 2 is an exploded perspective view of a very similar drill stand asshown in FIG. 1, but with a different carriage.

FIG. 3 is a perspective view of a drill stand according to the presentinvention as seen from above.

FIG. 4 is an enlarged view of the encircled area in FIG. 3 showing theclamping arrangement between the back support and the drill column.

FIG. 5 is a perspective view of the drill stand in FIG. 3 as seen fromabove, but where the back support has been removed.

FIG. 6 is an enlarged view of the encircled area in FIG. 5 showing theclamping arrangement without the back support.

FIG. 7 is an enlarged exploded perspective view of the clampingarrangement and the back support of the drill stand shown in FIG. 2.

FIG. 8 is a perspective view of the back support and the clampingarrangement attached to this, as seen from above.

FIG. 9 is an enlarged view of the encircled area in FIG. 8 showing theclamping arrangement attached to the back support.

DESCRIPTION OF PREFERRED EMBODIMENTS

FIG. 1 shows a drill stand 1 according to one preferred embodiment ofthe present invention. The drill stand 1 comprises a base plate 2, whichis adapted to be fastened to a floor or a wall, either by using anexpander bolt or using a vacuum system. Also, the drill stand comprisesa carriage 3, arranged on a drill column 4 and adapted to carry a drillmotor. The carriage 3 is provided with a feeder handle 27 for moving thecarriage along the drill column 4 and a motor connection part 28 forattachment of the drill motor. The drill column 4 is pivotally mountedto a front part 5 of the base plate 2 and turns around a drill columnaxle 6. Also, the drill column 4 is supported by a back support 7, whichis pivotally mounted to a back part 8 of the base plate 2 and turnsaround a back support axle 9. A longitudinal direction is defined as adirection running through the centers of the drill column 4 and the backsupport 7 either from the front to the back part of the base plate, orvice versa. The drill column axle 6 and the back support axle 9 areessentially parallel and run in a lateral direction; i.e., lateral inrelation to the longitudinal direction. The back support 7 is attachedto the drill column 4 by means of a clamping arrangement 29. On the rearside of the back support 7 a carry handle 30 for transportation of thedrill stand 1 is provided.

The base plate 2 is provided with an expander bolt aperture 31,extending in a longitudinal direction and used for fastening the baseplate 2 in a floor or in a wall. The aperture 31 is arranged such thatan anchor bolt is anchored to the floor or wall and can extend from thefloor or wall and up through the aperture 31. The base plate 2 can befastened to the floor by means of a nut, which is screwed on to theprotruding part of the anchor bolt and tightened against the base plate2. Alternatively, a vacuum lock can be used. A slot guard 32 is providedaround the expander bolt aperture and sealingly applied to the baseplate 2. The slot guard 32 is made of steel and is more scratchresistant than the base plate 2, which is usually made of aluminium.Thereby the slot guard 32 provides a more reliable seal for the vacuumlocking than the prior art solutions. This is because the top surface ofthe slot guard is provided with a gasket 33 for sealing between the slotguard and a vacuum cap 34 when using vacuum locking (see FIG. 2).Preferably, a surface coating is provided on at least the top surface ofthe slot guard to provide improved scratch resistance. For this, a hardmetal coating like nickel can be used.

FIG. 2 shows an exploded view of the drill stand 1 depicted in FIG. 1.In addition to the components shown in FIG. 1, this FIG. 2 also depictsthe gasket 33, the vacuum cap 34 and a vacuum quick disconnect 35 whichare used for obtaining a vacuum locking of the base plate 2 against asurface.

FIG. 3 shows that the back support 7 is attached to the drill column 4by means of a clamping arrangement 29.

FIG. 4 shows the clamping arrangement 29 between the back support 7 andthe drill column 4 The back side of the drill column 4 is arranged as atrack 10 having lateral wings 11, 11′, a right wing 11 and a left wing11′, as seen from the front side of the drill stand 4. Each wing 11, 11′extends laterally from outside and inwards, but are separated by anelongate opening 12. The clamping arrangement 29 comprises a centerclamp 15, which has a flange part 26 fitting in the elongate opening ofthe drill column, and two outer clamps, right 17 and left 17′. Aclamping element 24, 25 is provided for pressing the outer clamps 17,17′ laterally together against the center clamp. The clampingarrangement 29 is connected both to the back support 7 and to the track10, so as to fix the back support 7 to the drill column 4 in differentpositions along the track 10 by clamping.

FIG. 5 shows a perspective view of the drill stand where the backsupport has been removed to more clearly show the clamping arrangement29.

FIG. 6 shows the clamping arrangement 29 mounted on the drill column 4.FIG. 7 shows the clamping arrangement 29 and the back support 7 in anexploded view. FIG. 9 shows the clamping arrangement mounted in the backsupport 7. By comparing FIGS. 6, 7 and 9 the following description isbest understood.

Each of the outer clamps 17, 17′ has a lateral contact surface 18, 18′,arranged to contact the respective outside rear surface 13, 13′ of thetrack 10. Each outer clamp 17, 17′ is arranged outside of the centerclamp 15 and has an outer angled contact element 19, 19′, intended tocooperate with center angled contact elements 20, 20′ arranged on thecenter clamp 15. Preferably, the outer angled contact elements 19, 19′and the center angled contact elements 20, 20′ are provided in the formof angled surfaces, i.e. surfaces that neither run in a longitudinal norin a lateral direction, but in an intermediate direction. However, itshould be noted that in alternative embodiments either the center angledcontact elements 20, 20′or the outer angled contact elements 19, 19′could be provided in the form of something else than angled surfaces.For example, one or both of the center angled contact elements 20, 20′could be provided as having a contact area in the form of a bump ofvarious shape. Also the contact area could be part of a rotatable bodylike a roller; e.g., using ball or roller bearings to reduce friction.And of course all this could also apply to one or both of the contactareas of the outer angled contact elements 19, 19′. Preferably, theoutside rear surfaces 13, 13′ as well as the inside forward surfaces 14,14′ of the track 10 run in an essentially lateral direction.

The center clamp 15 has protrusions, right 16 and left 16′, extendinglaterally from the flange part 26 and intended to contact the insideforward surfaces 14, 14′ of the track 10. The outer clamps, right andleft 17, 17′ have longitudinal contact surfaces, right and left 22, 22′contacting a longitudinal outside contact surface, right and left 23,23′ of the track 10 or drill column 4.

When the clamping element 24, 25 presses the outer clamps 17, 17′together in a lateral direction against the center clamp 15, the outerangled contact elements 19, 19′ of the outer clamps cooperate withcenter angled contact elements 20, 20′, providing a longitudinalbackwards motion of the center clamp 15 in relation to the outer clamps17, 17′. Thereby, the protrusions 16, 16′ of the center clamp 15 arepressed against the inside forward surfaces 14, 14′ and the lateralcontact surfaces 18, 18′ of the outer clamps are pressed against theoutside rear surfaces 13, 13′. This way a clamping in a longitudinaldirection is provided. If the outer clamps 17, 17′ are also providedwith longitudinal contact surfaces 22, 22′, a clamping also in thelateral direction is possible. This provides a further improvedembodiment having clamping in both a longitudinal and a lateraldirection. Therefore, when the outer clamps 17, 17′ are pressedtogether, the longitudinal contact surfaces 22, 22′ of the outer clampsare pressed against the outside contact surfaces 23, 23′ of the track 10or the drill column 4, providing a clamping in a lateral direction.

Preferably, the clamping element 24, 25 comprises a clamping screw 24and a lock nut 25. The clamping screw 24 is adapted to be fastened tothe back support 7 and to run through holes 36, 36′ in the outer clamps17, 17′ and through a hole 37 in the center clamp 15. The lock nut 25 isarranged to press against either of the outer clamps 17, 17′, i.e. thenut could be located either on the right or left side of the drillstand.

The clamping screw 24 can be fastened to the back support 7 by being ledthrough a clamping screw hole 38 in a first tongue 39 of a clamping fork40 and further on through a lock nut aperture 42 in a second tongue 41of the fork, and being secured in a lock nut 25. The lock nut aperture42 is adapted to prevent the nut 25 from rotating but also to enable itto at least partly move through the aperture 42 and press against eitherof the outer clamps 17, 17′.

The clamping element 24, 25 could also be a tensioning device with a rodhaving a head in one end and quick tensioner in the other, like a camrotatable around an axis lateral to the length axis of the rod and thecam supplied with a handle for quick tensioning without tools.

1-11. (canceled)
 12. Drill stand comprising a base plate, a carriagearranged to be able to carry a drill motor and a drill column which ispivotally mounted to a front part of the base plate, said drill columnbeing supported by a back support which is located in a longitudinaldirection rear of said drill column and is pivotally mounted to a backpart of the base plate, and a back side of the drill column facing theback support is arranged as a track having lateral wings, a right sidewing and a left side wing, as seen from the front side of the drillstand, and each wing extending laterally from outside and inwards, butbeing separated by an elongate opening, each lateral wing having anoutside rear surface, right and left and an inside forward surface,right and left, and a clamping arrangement is fastened both to the backsupport and to the track enabling them to be fixed to each other indifferent positions along the track by clamping, wherein the clampingarrangement comprises a center clamp having a flange part fitting in theelongate opening and having protrusions, right and left, from the flangepart intended to contact the inside forward surfaces, right and left,when clamping, the clamping arrangement further comprising an outerclamp right and an outer clamp left each having at least a lateralcontact surface arranged to contact the respective outside rear surfacewhen clamping, each outer clamp being arranged outside of the centerclamp and having outer angled contact elements intended to cooperatewith center angled contact elements to provide a longitudinal backwardsmotion of the center clamp in relation to the outer clamps when aclamping element is pressing the outer clamps laterally together againstthe center clamp making its protrusions press against the inside forwardsurfaces, and making the lateral contact surfaces of the outer clampspress against the outside rear surfaces, i.e providing a clamping in alongitudinal direction.
 13. Drill stand according to claim 12, whereinthe outer clamps, right and left, each have a longitudinal contactsurface, right and left, contacting a longitudinal contact surface ofthe track or drill column, right and left when clamping thereforecreating a clamping also involving clamping in a lateral direction inaddition to the clamping in the longitudinal direction.
 14. Drill standaccording to claim 12, wherein the drill column turns around a drillcolumn axle and the back support turns around a back support axle, andboth axles are essentially parallel and run in a lateral direction. 15.Drill stand according to claim 12, wherein at least one of the outerangled contact elements and the center angled contact elements is anangled surface, i.e. a surface that neither runs in a longitudinal norin a lateral direction but in an intermediate direction.
 16. Drill standaccording to claim 12, wherein both the outer angled contact elementsand the center angled contact elements have angled surfaces.
 17. Drillstand according to claim 12, wherein the clamping element comprises aclamping screw, fastened to the back support and running through holesin the outer clamps and through a hole in the center clamp, and a locknut arranged to press against either of the outer clamps.
 18. Drillstand according to claim 17, wherein the clamping screw is fastened tothe back support by being led through a clamping screw hole in a firsttongue of a clamping fork and through a lock nut aperture in a secondtongue of the fork and secured in a lock nut, the lock nut aperturebeing adapted to prevent the nut from rotating but enable it to at leastpartly move through the aperture and press against either of the outerclamps.
 19. Drill stand according to claim 12, wherein the insideforward surfaces and the outside rear surfaces of the track run in anessentially lateral direction.
 20. Drill stand comprising a base plate,a drill column, which is mounted to the base plate, and a carriagearranged on the drill column to be able to carry a drill motor, saidbase plate being provided with at least one expander bolt aperture,characterized in that a slot guard is provided around the expander boltaperture(s).
 21. Drill stand according to claim 20, wherein the baseplate is made of Aluminium and the slot guard is made of steel and issealingly applied to the base plate and the top surface of the slotguard being more scratch resistant than the base plate itself andtherefore providing a more reliable seal under a vacuum cap and itsgasket provided between the vacuum cap and the slot guard.
 22. Drillstand according to claim 20, wherein a surface coating is provided on atleast the top surface of the slot guard to provide improved scratchresistance and preferably a hard metal coating like Nickel.